server name points to my clients sites!?

Hello,
I find this problem quite odd.
server name is suppose to point to a cpanel non site configuration page
but for some ODD reason its pointing to one of my clients site
servername: server1.websupportsite.net
points to: astrologyguild.com???
I had this same problem when I was playing with my IPs.
please help ... it's like giving her free marketing lol
anyone know a file I can configure or how to fix this??